This is a timely question for current breakout in Texas. It is an extremely
contagious disease readily spreading. Fortunately seniors have been exposed
to the natural infection prior to the advent of the vaccine. If we grew up in
the 40s and fifties we had multiple exposures and likely natural infections
with variable degree of symptoms. Natural immunity is thought to remain robust enough for most seniors to be protected. That being said my wife and
I contracted whooping cough when we were in our 60s after visiting an area
with lots of anti- vaccine people during an outbreak. If you have concerns
that you are the 1% unprotected your doctor can order a blood test to check your immune titer. I did do RSV this year and I’m due for my last tetanus
immunization at age 77.